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[net-next-2.6.git] / net / netfilter / nf_conntrack_netlink.c
CommitLineData
c1d10adb
PNA		 1/* Connection tracking via netlink socket. Allows for user space
2 * protocol helpers and general trouble making from userspace.
3 *
4 * (C) 2001 by Jay Schulist <jschlst@samba.org>
dc808fe2 5 * (C) 2002-2006 by Harald Welte <laforge@gnumonks.org>
c1d10adb 6 * (C) 2003 by Patrick Mchardy <kaber@trash.net>
1cde6436 7 * (C) 2005-2006 by Pablo Neira Ayuso <pablo@eurodev.net>
c1d10adb
PNA		 8 *
9 * I've reworked this stuff to use attributes instead of conntrack
10 * structures. 5.44 am. I need more tea. --pablo 05/07/11.
11 *
12 * Initial connection tracking via netlink development funded and
13 * generally made possible by Network Robots, Inc. (www.networkrobots.com)
14 *
15 * Further development of this code funded by Astaro AG (http://www.astaro.com)
16 *
17 * This software may be used and distributed according to the terms
18 * of the GNU General Public License, incorporated herein by reference.
19 *
20 * Derived from ip_conntrack_netlink.c: Port by Pablo Neira Ayuso (05/11/14)
21 */
22
23#include <linux/init.h>
24#include <linux/module.h>
25#include <linux/kernel.h>
26#include <linux/types.h>
27#include <linux/timer.h>
28#include <linux/skbuff.h>
29#include <linux/errno.h>
30#include <linux/netlink.h>
31#include <linux/spinlock.h>
40a839fd 32#include <linux/interrupt.h>
c1d10adb
PNA		 33#include <linux/notifier.h>
34
35#include <linux/netfilter.h>
36#include <net/netfilter/nf_conntrack.h>
37#include <net/netfilter/nf_conntrack_core.h>
77ab9cff 38#include <net/netfilter/nf_conntrack_expect.h>
c1d10adb
PNA		 39#include <net/netfilter/nf_conntrack_helper.h>
40#include <net/netfilter/nf_conntrack_l3proto.h>
41#include <net/netfilter/nf_conntrack_protocol.h>
42#include <linux/netfilter_ipv4/ip_nat_protocol.h>
43
44#include <linux/netfilter/nfnetlink.h>
45#include <linux/netfilter/nfnetlink_conntrack.h>
46
47MODULE_LICENSE("GPL");
48
dc808fe2 49static char __initdata version[] = "0.93";
c1d10adb 50
c1d10adb
PNA		 51static inline int
52ctnetlink_dump_tuples_proto(struct sk_buff *skb,
1cde6436
PNA		 53 const struct nf_conntrack_tuple *tuple,
54 struct nf_conntrack_protocol *proto)
c1d10adb 55{
c1d10adb 56 int ret = 0;
1cde6436 57 struct nfattr *nest_parms = NFA_NEST(skb, CTA_TUPLE_PROTO);
c1d10adb
PNA		 58
59 NFA_PUT(skb, CTA_PROTO_NUM, sizeof(u_int8_t), &tuple->dst.protonum);
60
c1d10adb
PNA		 61 if (likely(proto->tuple_to_nfattr))
62 ret = proto->tuple_to_nfattr(skb, tuple);
63
1cde6436 64 NFA_NEST_END(skb, nest_parms);
c1d10adb
PNA		 65
66 return ret;
67
68nfattr_failure:
69 return -1;
70}
71
72static inline int
1cde6436
PNA		 73ctnetlink_dump_tuples_ip(struct sk_buff *skb,
74 const struct nf_conntrack_tuple *tuple,
75 struct nf_conntrack_l3proto *l3proto)
c1d10adb 76{
c1d10adb 77 int ret = 0;
1cde6436
PNA		 78 struct nfattr *nest_parms = NFA_NEST(skb, CTA_TUPLE_IP);
79
c1d10adb
PNA		 80 if (likely(l3proto->tuple_to_nfattr))
81 ret = l3proto->tuple_to_nfattr(skb, tuple);
1cde6436 82
c1d10adb
PNA		 83 NFA_NEST_END(skb, nest_parms);
84
1cde6436
PNA		 85 return ret;
86
87nfattr_failure:
88 return -1;
89}
90
91static inline int
92ctnetlink_dump_tuples(struct sk_buff *skb,
93 const struct nf_conntrack_tuple *tuple)
94{
95 int ret;
96 struct nf_conntrack_l3proto *l3proto;
97 struct nf_conntrack_protocol *proto;
98
99 l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
100 ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
c1d10adb
PNA		 101 nf_ct_l3proto_put(l3proto);
102
103 if (unlikely(ret < 0))
104 return ret;
105
1cde6436
PNA		 106 proto = nf_ct_proto_find_get(tuple->src.l3num, tuple->dst.protonum);
107 ret = ctnetlink_dump_tuples_proto(skb, tuple, proto);
108 nf_ct_proto_put(proto);
c1d10adb
PNA		 109
110 return ret;
c1d10adb
PNA		 111}
112
113static inline int
114ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
115{
116 u_int32_t status = htonl((u_int32_t) ct->status);
117 NFA_PUT(skb, CTA_STATUS, sizeof(status), &status);
118 return 0;
119
120nfattr_failure:
121 return -1;
122}
123
124static inline int
125ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
126{
127 long timeout_l = ct->timeout.expires - jiffies;
128 u_int32_t timeout;
129
130 if (timeout_l < 0)
131 timeout = 0;
132 else
133 timeout = htonl(timeout_l / HZ);
134
135 NFA_PUT(skb, CTA_TIMEOUT, sizeof(timeout), &timeout);
136 return 0;
137
138nfattr_failure:
139 return -1;
140}
141
142static inline int
143ctnetlink_dump_protoinfo(struct sk_buff *skb, const struct nf_conn *ct)
144{
145 struct nf_conntrack_protocol *proto = nf_ct_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num, ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
146 struct nfattr *nest_proto;
147 int ret;
148
149 if (!proto->to_nfattr) {
150 nf_ct_proto_put(proto);
151 return 0;
152 }
153
154 nest_proto = NFA_NEST(skb, CTA_PROTOINFO);
155
156 ret = proto->to_nfattr(skb, nest_proto, ct);
157
158 nf_ct_proto_put(proto);
159
160 NFA_NEST_END(skb, nest_proto);
161
162 return ret;
163
164nfattr_failure:
c537b75a 165 nf_ct_proto_put(proto);
c1d10adb
PNA		 166 return -1;
167}
168
169static inline int
170ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
171{
172 struct nfattr *nest_helper;
dc808fe2 173 const struct nf_conn_help *help = nfct_help(ct);
c1d10adb 174
dc808fe2 175 if (!help || !help->helper)
c1d10adb
PNA		 176 return 0;
177
178 nest_helper = NFA_NEST(skb, CTA_HELP);
dc808fe2 179 NFA_PUT(skb, CTA_HELP_NAME, strlen(help->helper->name), help->helper->name);
c1d10adb 180
dc808fe2
HW		 181 if (help->helper->to_nfattr)
182 help->helper->to_nfattr(skb, ct);
c1d10adb
PNA		 183
184 NFA_NEST_END(skb, nest_helper);
185
186 return 0;
187
188nfattr_failure:
189 return -1;
190}
191
192#ifdef CONFIG_NF_CT_ACCT
193static inline int
194ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
195 enum ip_conntrack_dir dir)
196{
197 enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
198 struct nfattr *nest_count = NFA_NEST(skb, type);
199 u_int32_t tmp;
200
201 tmp = htonl(ct->counters[dir].packets);
202 NFA_PUT(skb, CTA_COUNTERS32_PACKETS, sizeof(u_int32_t), &tmp);
203
204 tmp = htonl(ct->counters[dir].bytes);
205 NFA_PUT(skb, CTA_COUNTERS32_BYTES, sizeof(u_int32_t), &tmp);
206
207 NFA_NEST_END(skb, nest_count);
208
209 return 0;
210
211nfattr_failure:
212 return -1;
213}
214#else
215#define ctnetlink_dump_counters(a, b, c) (0)
216#endif
217
218#ifdef CONFIG_NF_CONNTRACK_MARK
219static inline int
220ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
221{
222 u_int32_t mark = htonl(ct->mark);
223
224 NFA_PUT(skb, CTA_MARK, sizeof(u_int32_t), &mark);
225 return 0;
226
227nfattr_failure:
228 return -1;
229}
230#else
231#define ctnetlink_dump_mark(a, b) (0)
232#endif
233
234static inline int
235ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
236{
237 u_int32_t id = htonl(ct->id);
238 NFA_PUT(skb, CTA_ID, sizeof(u_int32_t), &id);
239 return 0;
240
241nfattr_failure:
242 return -1;
243}
244
245static inline int
246ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
247{
248 u_int32_t use = htonl(atomic_read(&ct->ct_general.use));
249
250 NFA_PUT(skb, CTA_USE, sizeof(u_int32_t), &use);
251 return 0;
252
253nfattr_failure:
254 return -1;
255}
256
257#define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
258
259static int
260ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
261 int event, int nowait,
262 const struct nf_conn *ct)
263{
264 struct nlmsghdr *nlh;
265 struct nfgenmsg *nfmsg;
266 struct nfattr *nest_parms;
267 unsigned char *b;
268
269 b = skb->tail;
270
271 event |= NFNL_SUBSYS_CTNETLINK << 8;
272 nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
273 nfmsg = NLMSG_DATA(nlh);
274
275 nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
276 nfmsg->nfgen_family =
277 ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
278 nfmsg->version = NFNETLINK_V0;
279 nfmsg->res_id = 0;
280
281 nest_parms = NFA_NEST(skb, CTA_TUPLE_ORIG);
282 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
283 goto nfattr_failure;
284 NFA_NEST_END(skb, nest_parms);
285
286 nest_parms = NFA_NEST(skb, CTA_TUPLE_REPLY);
287 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
288 goto nfattr_failure;
289 NFA_NEST_END(skb, nest_parms);
290
291 if (ctnetlink_dump_status(skb, ct) < 0 ||
292 ctnetlink_dump_timeout(skb, ct) < 0 ||
293 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
294 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
295 ctnetlink_dump_protoinfo(skb, ct) < 0 ||
296 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
297 ctnetlink_dump_mark(skb, ct) < 0 ||
298 ctnetlink_dump_id(skb, ct) < 0 ||
299 ctnetlink_dump_use(skb, ct) < 0)
300 goto nfattr_failure;
301
302 nlh->nlmsg_len = skb->tail - b;
303 return skb->len;
304
305nlmsg_failure:
306nfattr_failure:
307 skb_trim(skb, b - skb->data);
308 return -1;
309}
310
311#ifdef CONFIG_NF_CONNTRACK_EVENTS
312static int ctnetlink_conntrack_event(struct notifier_block *this,
313 unsigned long events, void *ptr)
314{
315 struct nlmsghdr *nlh;
316 struct nfgenmsg *nfmsg;
317 struct nfattr *nest_parms;
318 struct nf_conn *ct = (struct nf_conn *)ptr;
319 struct sk_buff *skb;
320 unsigned int type;
321 unsigned char *b;
322 unsigned int flags = 0, group;
323
324 /* ignore our fake conntrack entry */
325 if (ct == &nf_conntrack_untracked)
326 return NOTIFY_DONE;
327
328 if (events & IPCT_DESTROY) {
329 type = IPCTNL_MSG_CT_DELETE;
330 group = NFNLGRP_CONNTRACK_DESTROY;
331 } else if (events & (IPCT_NEW | IPCT_RELATED)) {
332 type = IPCTNL_MSG_CT_NEW;
333 flags = NLM_F_CREATE|NLM_F_EXCL;
334 /* dump everything */
335 events = ~0UL;
336 group = NFNLGRP_CONNTRACK_NEW;
1a31526b 337 } else if (events & (IPCT_STATUS | IPCT_PROTOINFO)) {
c1d10adb
PNA		 338 type = IPCTNL_MSG_CT_NEW;
339 group = NFNLGRP_CONNTRACK_UPDATE;
340 } else
341 return NOTIFY_DONE;
a2427692
PM		 342
343 if (!nfnetlink_has_listeners(group))
344 return NOTIFY_DONE;
345
c1d10adb
PNA		 346 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
347 if (!skb)
348 return NOTIFY_DONE;
349
350 b = skb->tail;
351
352 type |= NFNL_SUBSYS_CTNETLINK << 8;
353 nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
354 nfmsg = NLMSG_DATA(nlh);
355
356 nlh->nlmsg_flags = flags;
357 nfmsg->nfgen_family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
358 nfmsg->version = NFNETLINK_V0;
359 nfmsg->res_id = 0;
360
361 nest_parms = NFA_NEST(skb, CTA_TUPLE_ORIG);
362 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
363 goto nfattr_failure;
364 NFA_NEST_END(skb, nest_parms);
365
366 nest_parms = NFA_NEST(skb, CTA_TUPLE_REPLY);
367 if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
368 goto nfattr_failure;
369 NFA_NEST_END(skb, nest_parms);
370
371 /* NAT stuff is now a status flag */
372 if ((events & IPCT_STATUS || events & IPCT_NATINFO)
373 && ctnetlink_dump_status(skb, ct) < 0)
374 goto nfattr_failure;
375 if (events & IPCT_REFRESH
376 && ctnetlink_dump_timeout(skb, ct) < 0)
377 goto nfattr_failure;
378 if (events & IPCT_PROTOINFO
379 && ctnetlink_dump_protoinfo(skb, ct) < 0)
380 goto nfattr_failure;
381 if (events & IPCT_HELPINFO
382 && ctnetlink_dump_helpinfo(skb, ct) < 0)
383 goto nfattr_failure;
384
385 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
386 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
387 goto nfattr_failure;
388
b9a37e0c
PNA		 389 if (events & IPCT_MARK
390 && ctnetlink_dump_mark(skb, ct) < 0)
391 goto nfattr_failure;
392
c1d10adb
PNA		 393 nlh->nlmsg_len = skb->tail - b;
394 nfnetlink_send(skb, 0, group, 0);
395 return NOTIFY_DONE;
396
397nlmsg_failure:
398nfattr_failure:
399 kfree_skb(skb);
400 return NOTIFY_DONE;
401}
402#endif /* CONFIG_NF_CONNTRACK_EVENTS */
403
404static int ctnetlink_done(struct netlink_callback *cb)
405{
89f2e218
PM		 406 if (cb->args[1])
407 nf_ct_put((struct nf_conn *)cb->args[1]);
c1d10adb
PNA		 408 return 0;
409}
410
87711cb8
PNA		 411#define L3PROTO(ct) ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num
412
c1d10adb
PNA		 413static int
414ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
415{
89f2e218 416 struct nf_conn *ct, *last;
c1d10adb
PNA		 417 struct nf_conntrack_tuple_hash *h;
418 struct list_head *i;
87711cb8
PNA		 419 struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
420 u_int8_t l3proto = nfmsg->nfgen_family;
c1d10adb 421
c1d10adb 422 read_lock_bh(&nf_conntrack_lock);
d205dc40 423 last = (struct nf_conn *)cb->args[1];
89f2e218
PM		 424 for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
425restart:
c1d10adb
PNA		 426 list_for_each_prev(i, &nf_conntrack_hash[cb->args[0]]) {
427 h = (struct nf_conntrack_tuple_hash *) i;
428 if (DIRECTION(h) != IP_CT_DIR_ORIGINAL)
429 continue;
430 ct = nf_ct_tuplehash_to_ctrack(h);
87711cb8
PNA		 431 /* Dump entries of a given L3 protocol number.
432 * If it is not specified, ie. l3proto == 0,
433 * then dump everything. */
434 if (l3proto && L3PROTO(ct) != l3proto)
435 continue;
d205dc40
PM		 436 if (cb->args[1]) {
437 if (ct != last)
89f2e218 438 continue;
d205dc40 439 cb->args[1] = 0;
89f2e218 440 }
c1d10adb
PNA		 441 if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
442 cb->nlh->nlmsg_seq,
443 IPCTNL_MSG_CT_NEW,
89f2e218
PM		 444 1, ct) < 0) {
445 nf_conntrack_get(&ct->ct_general);
446 cb->args[1] = (unsigned long)ct;
c1d10adb 447 goto out;
89f2e218 448 }
01f34848
PNA		 449#ifdef CONFIG_NF_CT_ACCT
450 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
451 IPCTNL_MSG_CT_GET_CTRZERO)
452 memset(&ct->counters, 0, sizeof(ct->counters));
453#endif
89f2e218 454 }
d205dc40 455 if (cb->args[1]) {
89f2e218
PM		 456 cb->args[1] = 0;
457 goto restart;
c1d10adb
PNA		 458 }
459 }
89f2e218 460out:
c1d10adb 461 read_unlock_bh(&nf_conntrack_lock);
d205dc40
PM		 462 if (last)
463 nf_ct_put(last);
c1d10adb 464
c1d10adb
PNA		 465 return skb->len;
466}
467
c1d10adb
PNA		 468static inline int
469ctnetlink_parse_tuple_ip(struct nfattr *attr, struct nf_conntrack_tuple *tuple)
470{
471 struct nfattr *tb[CTA_IP_MAX];
472 struct nf_conntrack_l3proto *l3proto;
473 int ret = 0;
474
c1d10adb
PNA		 475 nfattr_parse_nested(tb, CTA_IP_MAX, attr);
476
477 l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
478
479 if (likely(l3proto->nfattr_to_tuple))
480 ret = l3proto->nfattr_to_tuple(tb, tuple);
481
482 nf_ct_l3proto_put(l3proto);
483
c1d10adb
PNA		 484 return ret;
485}
486
487static const size_t cta_min_proto[CTA_PROTO_MAX] = {
488 [CTA_PROTO_NUM-1] = sizeof(u_int8_t),
489};
490
491static inline int
492ctnetlink_parse_tuple_proto(struct nfattr *attr,
493 struct nf_conntrack_tuple *tuple)
494{
495 struct nfattr *tb[CTA_PROTO_MAX];
496 struct nf_conntrack_protocol *proto;
497 int ret = 0;
498
c1d10adb
PNA		 499 nfattr_parse_nested(tb, CTA_PROTO_MAX, attr);
500
501 if (nfattr_bad_size(tb, CTA_PROTO_MAX, cta_min_proto))
502 return -EINVAL;
503
504 if (!tb[CTA_PROTO_NUM-1])
505 return -EINVAL;
506 tuple->dst.protonum = *(u_int8_t *)NFA_DATA(tb[CTA_PROTO_NUM-1]);
507
508 proto = nf_ct_proto_find_get(tuple->src.l3num, tuple->dst.protonum);
509
510 if (likely(proto->nfattr_to_tuple))
511 ret = proto->nfattr_to_tuple(tb, tuple);
512
513 nf_ct_proto_put(proto);
514
515 return ret;
516}
517
518static inline int
519ctnetlink_parse_tuple(struct nfattr *cda[], struct nf_conntrack_tuple *tuple,
520 enum ctattr_tuple type, u_int8_t l3num)
521{
522 struct nfattr *tb[CTA_TUPLE_MAX];
523 int err;
524
c1d10adb
PNA		 525 memset(tuple, 0, sizeof(*tuple));
526
527 nfattr_parse_nested(tb, CTA_TUPLE_MAX, cda[type-1]);
528
529 if (!tb[CTA_TUPLE_IP-1])
530 return -EINVAL;
531
532 tuple->src.l3num = l3num;
533
534 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP-1], tuple);
535 if (err < 0)
536 return err;
537
538 if (!tb[CTA_TUPLE_PROTO-1])
539 return -EINVAL;
540
541 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO-1], tuple);
542 if (err < 0)
543 return err;
544
545 /* orig and expect tuples get DIR_ORIGINAL */
546 if (type == CTA_TUPLE_REPLY)
547 tuple->dst.dir = IP_CT_DIR_REPLY;
548 else
549 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
550
c1d10adb
PNA		 551 return 0;
552}
553
554#ifdef CONFIG_IP_NF_NAT_NEEDED
555static const size_t cta_min_protonat[CTA_PROTONAT_MAX] = {
556 [CTA_PROTONAT_PORT_MIN-1] = sizeof(u_int16_t),
557 [CTA_PROTONAT_PORT_MAX-1] = sizeof(u_int16_t),
558};
559
560static int ctnetlink_parse_nat_proto(struct nfattr *attr,
561 const struct nf_conn *ct,
562 struct ip_nat_range *range)
563{
564 struct nfattr *tb[CTA_PROTONAT_MAX];
565 struct ip_nat_protocol *npt;
566
c1d10adb
PNA		 567 nfattr_parse_nested(tb, CTA_PROTONAT_MAX, attr);
568
569 if (nfattr_bad_size(tb, CTA_PROTONAT_MAX, cta_min_protonat))
570 return -EINVAL;
571
572 npt = ip_nat_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
573
574 if (!npt->nfattr_to_range) {
575 ip_nat_proto_put(npt);
576 return 0;
577 }
578
579 /* nfattr_to_range returns 1 if it parsed, 0 if not, neg. on error */
580 if (npt->nfattr_to_range(tb, range) > 0)
581 range->flags |= IP_NAT_RANGE_PROTO_SPECIFIED;
582
583 ip_nat_proto_put(npt);
584
c1d10adb
PNA		 585 return 0;
586}
587
588static const size_t cta_min_nat[CTA_NAT_MAX] = {
589 [CTA_NAT_MINIP-1] = sizeof(u_int32_t),
590 [CTA_NAT_MAXIP-1] = sizeof(u_int32_t),
591};
592
593static inline int
3726add7 594ctnetlink_parse_nat(struct nfattr *nat,
c1d10adb
PNA		 595 const struct nf_conn *ct, struct ip_nat_range *range)
596{
597 struct nfattr *tb[CTA_NAT_MAX];
598 int err;
599
c1d10adb
PNA		 600 memset(range, 0, sizeof(*range));
601
3726add7 602 nfattr_parse_nested(tb, CTA_NAT_MAX, nat);
c1d10adb
PNA		 603
604 if (nfattr_bad_size(tb, CTA_NAT_MAX, cta_min_nat))
605 return -EINVAL;
606
607 if (tb[CTA_NAT_MINIP-1])
608 range->min_ip = *(u_int32_t *)NFA_DATA(tb[CTA_NAT_MINIP-1]);
609
610 if (!tb[CTA_NAT_MAXIP-1])
611 range->max_ip = range->min_ip;
612 else
613 range->max_ip = *(u_int32_t *)NFA_DATA(tb[CTA_NAT_MAXIP-1]);
614
615 if (range->min_ip)
616 range->flags |= IP_NAT_RANGE_MAP_IPS;
617
618 if (!tb[CTA_NAT_PROTO-1])
619 return 0;
620
621 err = ctnetlink_parse_nat_proto(tb[CTA_NAT_PROTO-1], ct, range);
622 if (err < 0)
623 return err;
624
c1d10adb
PNA		 625 return 0;
626}
627#endif
628
629static inline int
630ctnetlink_parse_help(struct nfattr *attr, char **helper_name)
631{
632 struct nfattr *tb[CTA_HELP_MAX];
633
c1d10adb
PNA		 634 nfattr_parse_nested(tb, CTA_HELP_MAX, attr);
635
636 if (!tb[CTA_HELP_NAME-1])
637 return -EINVAL;
638
639 *helper_name = NFA_DATA(tb[CTA_HELP_NAME-1]);
640
641 return 0;
642}
643
644static const size_t cta_min[CTA_MAX] = {
645 [CTA_STATUS-1] = sizeof(u_int32_t),
646 [CTA_TIMEOUT-1] = sizeof(u_int32_t),
647 [CTA_MARK-1] = sizeof(u_int32_t),
648 [CTA_USE-1] = sizeof(u_int32_t),
649 [CTA_ID-1] = sizeof(u_int32_t)
650};
651
652static int
653ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
654 struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
655{
656 struct nf_conntrack_tuple_hash *h;
657 struct nf_conntrack_tuple tuple;
658 struct nf_conn *ct;
659 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
660 u_int8_t u3 = nfmsg->nfgen_family;
661 int err = 0;
662
c1d10adb
PNA		 663 if (nfattr_bad_size(cda, CTA_MAX, cta_min))
664 return -EINVAL;
665
666 if (cda[CTA_TUPLE_ORIG-1])
667 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
668 else if (cda[CTA_TUPLE_REPLY-1])
669 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
670 else {
671 /* Flush the whole table */
672 nf_conntrack_flush();
673 return 0;
674 }
675
676 if (err < 0)
677 return err;
678
679 h = nf_conntrack_find_get(&tuple, NULL);
9ea8cfd6 680 if (!h)
c1d10adb 681 return -ENOENT;
c1d10adb
PNA		 682
683 ct = nf_ct_tuplehash_to_ctrack(h);
684
685 if (cda[CTA_ID-1]) {
686 u_int32_t id = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_ID-1]));
687 if (ct->id != id) {
688 nf_ct_put(ct);
689 return -ENOENT;
690 }
691 }
692 if (del_timer(&ct->timeout))
693 ct->timeout.function((unsigned long)ct);
694
695 nf_ct_put(ct);
c1d10adb
PNA		 696
697 return 0;
698}
699
700static int
701ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
702 struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
703{
704 struct nf_conntrack_tuple_hash *h;
705 struct nf_conntrack_tuple tuple;
706 struct nf_conn *ct;
707 struct sk_buff *skb2 = NULL;
708 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
709 u_int8_t u3 = nfmsg->nfgen_family;
710 int err = 0;
711
c1d10adb
PNA		 712 if (nlh->nlmsg_flags & NLM_F_DUMP) {
713 u32 rlen;
714
01f34848
PNA		 715#ifndef CONFIG_NF_CT_ACCT
716 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == IPCTNL_MSG_CT_GET_CTRZERO)
c1d10adb
PNA		 717 return -ENOTSUPP;
718#endif
01f34848
PNA		 719 if ((*errp = netlink_dump_start(ctnl, skb, nlh,
720 ctnetlink_dump_table,
721 ctnetlink_done)) != 0)
c1d10adb 722 return -EINVAL;
c1d10adb
PNA		 723
724 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
725 if (rlen > skb->len)
726 rlen = skb->len;
727 skb_pull(skb, rlen);
728 return 0;
729 }
730
731 if (nfattr_bad_size(cda, CTA_MAX, cta_min))
732 return -EINVAL;
733
734 if (cda[CTA_TUPLE_ORIG-1])
735 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
736 else if (cda[CTA_TUPLE_REPLY-1])
737 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
738 else
739 return -EINVAL;
740
741 if (err < 0)
742 return err;
743
744 h = nf_conntrack_find_get(&tuple, NULL);
9ea8cfd6 745 if (!h)
c1d10adb 746 return -ENOENT;
9ea8cfd6 747
c1d10adb
PNA		 748 ct = nf_ct_tuplehash_to_ctrack(h);
749
750 err = -ENOMEM;
751 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
752 if (!skb2) {
753 nf_ct_put(ct);
754 return -ENOMEM;
755 }
c1d10adb
PNA		 756
757 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
758 IPCTNL_MSG_CT_NEW, 1, ct);
759 nf_ct_put(ct);
760 if (err <= 0)
761 goto free;
762
763 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
764 if (err < 0)
765 goto out;
766
c1d10adb
PNA		 767 return 0;
768
769free:
770 kfree_skb(skb2);
771out:
772 return err;
773}
774
775static inline int
776ctnetlink_change_status(struct nf_conn *ct, struct nfattr *cda[])
777{
778 unsigned long d;
779 unsigned status = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_STATUS-1]));
780 d = ct->status ^ status;
781
782 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
783 /* unchangeable */
784 return -EINVAL;
785
786 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
787 /* SEEN_REPLY bit can only be set */
788 return -EINVAL;
789
790
791 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
792 /* ASSURED bit can only be set */
793 return -EINVAL;
794
3726add7 795 if (cda[CTA_NAT_SRC-1] || cda[CTA_NAT_DST-1]) {
c1d10adb
PNA		 796#ifndef CONFIG_IP_NF_NAT_NEEDED
797 return -EINVAL;
798#else
c1d10adb
PNA		 799 struct ip_nat_range range;
800
3726add7
PM		 801 if (cda[CTA_NAT_DST-1]) {
802 if (ctnetlink_parse_nat(cda[CTA_NAT_DST-1], ct,
803 &range) < 0)
804 return -EINVAL;
805 if (ip_nat_initialized(ct,
806 HOOK2MANIP(NF_IP_PRE_ROUTING)))
807 return -EEXIST;
808 ip_nat_setup_info(ct, &range, hooknum);
809 }
810 if (cda[CTA_NAT_SRC-1]) {
811 if (ctnetlink_parse_nat(cda[CTA_NAT_SRC-1], ct,
812 &range) < 0)
813 return -EINVAL;
814 if (ip_nat_initialized(ct,
815 HOOK2MANIP(NF_IP_POST_ROUTING)))
816 return -EEXIST;
817 ip_nat_setup_info(ct, &range, hooknum);
818 }
c1d10adb
PNA		 819#endif
820 }
821
822 /* Be careful here, modifying NAT bits can screw up things,
823 * so don't let users modify them directly if they don't pass
824 * ip_nat_range. */
825 ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
826 return 0;
827}
828
829
830static inline int
831ctnetlink_change_helper(struct nf_conn *ct, struct nfattr *cda[])
832{
833 struct nf_conntrack_helper *helper;
dc808fe2 834 struct nf_conn_help *help = nfct_help(ct);
c1d10adb
PNA		 835 char *helpname;
836 int err;
837
dc808fe2
HW		 838 if (!help) {
839 /* FIXME: we need to reallocate and rehash */
840 return -EBUSY;
841 }
842
c1d10adb
PNA		 843 /* don't change helper of sibling connections */
844 if (ct->master)
845 return -EINVAL;
846
847 err = ctnetlink_parse_help(cda[CTA_HELP-1], &helpname);
848 if (err < 0)
849 return err;
850
851 helper = __nf_conntrack_helper_find_byname(helpname);
852 if (!helper) {
853 if (!strcmp(helpname, ""))
854 helper = NULL;
855 else
856 return -EINVAL;
857 }
858
dc808fe2 859 if (help->helper) {
c1d10adb
PNA		 860 if (!helper) {
861 /* we had a helper before ... */
862 nf_ct_remove_expectations(ct);
dc808fe2 863 help->helper = NULL;
c1d10adb
PNA		 864 } else {
865 /* need to zero data of old helper */
dc808fe2 866 memset(&help->help, 0, sizeof(help->help));
c1d10adb
PNA		 867 }
868 }
869
dc808fe2 870 help->helper = helper;
c1d10adb
PNA		 871
872 return 0;
873}
874
875static inline int
876ctnetlink_change_timeout(struct nf_conn *ct, struct nfattr *cda[])
877{
878 u_int32_t timeout = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_TIMEOUT-1]));
879
880 if (!del_timer(&ct->timeout))
881 return -ETIME;
882
883 ct->timeout.expires = jiffies + timeout * HZ;
884 add_timer(&ct->timeout);
885
886 return 0;
887}
888
889static inline int
890ctnetlink_change_protoinfo(struct nf_conn *ct, struct nfattr *cda[])
891{
892 struct nfattr *tb[CTA_PROTOINFO_MAX], *attr = cda[CTA_PROTOINFO-1];
893 struct nf_conntrack_protocol *proto;
894 u_int16_t npt = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum;
895 u_int16_t l3num = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
896 int err = 0;
897
898 nfattr_parse_nested(tb, CTA_PROTOINFO_MAX, attr);
899
900 proto = nf_ct_proto_find_get(l3num, npt);
901
902 if (proto->from_nfattr)
903 err = proto->from_nfattr(tb, ct);
904 nf_ct_proto_put(proto);
905
906 return err;
907}
908
909static int
910ctnetlink_change_conntrack(struct nf_conn *ct, struct nfattr *cda[])
911{
912 int err;
913
c1d10adb
PNA		 914 if (cda[CTA_HELP-1]) {
915 err = ctnetlink_change_helper(ct, cda);
916 if (err < 0)
917 return err;
918 }
919
920 if (cda[CTA_TIMEOUT-1]) {
921 err = ctnetlink_change_timeout(ct, cda);
922 if (err < 0)
923 return err;
924 }
925
926 if (cda[CTA_STATUS-1]) {
927 err = ctnetlink_change_status(ct, cda);
928 if (err < 0)
929 return err;
930 }
931
932 if (cda[CTA_PROTOINFO-1]) {
933 err = ctnetlink_change_protoinfo(ct, cda);
934 if (err < 0)
935 return err;
936 }
937
bcd1e830 938#if defined(CONFIG_NF_CONNTRACK_MARK)
c1d10adb
PNA		 939 if (cda[CTA_MARK-1])
940 ct->mark = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_MARK-1]));
941#endif
942
c1d10adb
PNA		 943 return 0;
944}
945
946static int
947ctnetlink_create_conntrack(struct nfattr *cda[],
948 struct nf_conntrack_tuple *otuple,
949 struct nf_conntrack_tuple *rtuple)
950{
951 struct nf_conn *ct;
952 int err = -EINVAL;
dafc741c 953 struct nf_conn_help *help;
c1d10adb 954
c1d10adb
PNA		 955 ct = nf_conntrack_alloc(otuple, rtuple);
956 if (ct == NULL || IS_ERR(ct))
957 return -ENOMEM;
958
959 if (!cda[CTA_TIMEOUT-1])
960 goto err;
961 ct->timeout.expires = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_TIMEOUT-1]));
962
963 ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
964 ct->status |= IPS_CONFIRMED;
965
966 err = ctnetlink_change_status(ct, cda);
967 if (err < 0)
968 goto err;
969
970 if (cda[CTA_PROTOINFO-1]) {
971 err = ctnetlink_change_protoinfo(ct, cda);
972 if (err < 0)
973 return err;
974 }
975
bcd1e830 976#if defined(CONFIG_NF_CONNTRACK_MARK)
c1d10adb
PNA		 977 if (cda[CTA_MARK-1])
978 ct->mark = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_MARK-1]));
979#endif
980
dafc741c
YK		 981 help = nfct_help(ct);
982 if (help)
983 help->helper = nf_ct_helper_find_get(rtuple);
984
c1d10adb
PNA		 985 add_timer(&ct->timeout);
986 nf_conntrack_hash_insert(ct);
987
dafc741c
YK		 988 if (help && help->helper)
989 nf_ct_helper_put(help->helper);
990
c1d10adb
PNA		 991 return 0;
992
993err:
994 nf_conntrack_free(ct);
995 return err;
996}
997
998static int
999ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1000 struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
1001{
1002 struct nf_conntrack_tuple otuple, rtuple;
1003 struct nf_conntrack_tuple_hash *h = NULL;
1004 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1005 u_int8_t u3 = nfmsg->nfgen_family;
1006 int err = 0;
1007
c1d10adb
PNA		 1008 if (nfattr_bad_size(cda, CTA_MAX, cta_min))
1009 return -EINVAL;
1010
1011 if (cda[CTA_TUPLE_ORIG-1]) {
1012 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1013 if (err < 0)
1014 return err;
1015 }
1016
1017 if (cda[CTA_TUPLE_REPLY-1]) {
1018 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1019 if (err < 0)
1020 return err;
1021 }
1022
1023 write_lock_bh(&nf_conntrack_lock);
1024 if (cda[CTA_TUPLE_ORIG-1])
1025 h = __nf_conntrack_find(&otuple, NULL);
1026 else if (cda[CTA_TUPLE_REPLY-1])
1027 h = __nf_conntrack_find(&rtuple, NULL);
1028
1029 if (h == NULL) {
1030 write_unlock_bh(&nf_conntrack_lock);
c1d10adb
PNA		 1031 err = -ENOENT;
1032 if (nlh->nlmsg_flags & NLM_F_CREATE)
1033 err = ctnetlink_create_conntrack(cda, &otuple, &rtuple);
1034 return err;
1035 }
1036 /* implicit 'else' */
1037
1038 /* we only allow nat config for new conntracks */
3726add7 1039 if (cda[CTA_NAT_SRC-1] || cda[CTA_NAT_DST-1]) {
c1d10adb
PNA		 1040 err = -EINVAL;
1041 goto out_unlock;
1042 }
1043
1044 /* We manipulate the conntrack inside the global conntrack table lock,
1045 * so there's no need to increase the refcount */
c1d10adb
PNA		 1046 err = -EEXIST;
1047 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1048 err = ctnetlink_change_conntrack(nf_ct_tuplehash_to_ctrack(h), cda);
1049
1050out_unlock:
1051 write_unlock_bh(&nf_conntrack_lock);
1052 return err;
1053}
1054
1055/***********************************************************************
1056 * EXPECT
1057 ***********************************************************************/
1058
1059static inline int
1060ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1061 const struct nf_conntrack_tuple *tuple,
1062 enum ctattr_expect type)
1063{
1064 struct nfattr *nest_parms = NFA_NEST(skb, type);
1065
1066 if (ctnetlink_dump_tuples(skb, tuple) < 0)
1067 goto nfattr_failure;
1068
1069 NFA_NEST_END(skb, nest_parms);
1070
1071 return 0;
1072
1073nfattr_failure:
1074 return -1;
1075}
1076
1cde6436
PNA		 1077static inline int
1078ctnetlink_exp_dump_mask(struct sk_buff *skb,
1079 const struct nf_conntrack_tuple *tuple,
1080 const struct nf_conntrack_tuple *mask)
1081{
1082 int ret;
1083 struct nf_conntrack_l3proto *l3proto;
1084 struct nf_conntrack_protocol *proto;
1085 struct nfattr *nest_parms = NFA_NEST(skb, CTA_EXPECT_MASK);
1086
1087 l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
1088 ret = ctnetlink_dump_tuples_ip(skb, mask, l3proto);
1089 nf_ct_l3proto_put(l3proto);
1090
1091 if (unlikely(ret < 0))
1092 goto nfattr_failure;
1093
1094 proto = nf_ct_proto_find_get(tuple->src.l3num, tuple->dst.protonum);
1095 ret = ctnetlink_dump_tuples_proto(skb, mask, proto);
1096 nf_ct_proto_put(proto);
1097 if (unlikely(ret < 0))
1098 goto nfattr_failure;
1099
1100 NFA_NEST_END(skb, nest_parms);
1101
1102 return 0;
1103
1104nfattr_failure:
1105 return -1;
1106}
1107
c1d10adb
PNA		 1108static inline int
1109ctnetlink_exp_dump_expect(struct sk_buff *skb,
1110 const struct nf_conntrack_expect *exp)
1111{
1112 struct nf_conn *master = exp->master;
1113 u_int32_t timeout = htonl((exp->timeout.expires - jiffies) / HZ);
1114 u_int32_t id = htonl(exp->id);
1115
1116 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1117 goto nfattr_failure;
1cde6436 1118 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
c1d10adb
PNA		 1119 goto nfattr_failure;
1120 if (ctnetlink_exp_dump_tuple(skb,
1121 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1122 CTA_EXPECT_MASTER) < 0)
1123 goto nfattr_failure;
1124
1125 NFA_PUT(skb, CTA_EXPECT_TIMEOUT, sizeof(timeout), &timeout);
1126 NFA_PUT(skb, CTA_EXPECT_ID, sizeof(u_int32_t), &id);
1127
1128 return 0;
1129
1130nfattr_failure:
1131 return -1;
1132}
1133
1134static int
1135ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1136 int event,
1137 int nowait,
1138 const struct nf_conntrack_expect *exp)
1139{
1140 struct nlmsghdr *nlh;
1141 struct nfgenmsg *nfmsg;
1142 unsigned char *b;
1143
1144 b = skb->tail;
1145
1146 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1147 nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
1148 nfmsg = NLMSG_DATA(nlh);
1149
1150 nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
1151 nfmsg->nfgen_family = exp->tuple.src.l3num;
1152 nfmsg->version = NFNETLINK_V0;
1153 nfmsg->res_id = 0;
1154
1155 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1156 goto nfattr_failure;
1157
1158 nlh->nlmsg_len = skb->tail - b;
1159 return skb->len;
1160
1161nlmsg_failure:
1162nfattr_failure:
1163 skb_trim(skb, b - skb->data);
1164 return -1;
1165}
1166
1167#ifdef CONFIG_NF_CONNTRACK_EVENTS
1168static int ctnetlink_expect_event(struct notifier_block *this,
1169 unsigned long events, void *ptr)
1170{
1171 struct nlmsghdr *nlh;
1172 struct nfgenmsg *nfmsg;
1173 struct nf_conntrack_expect *exp = (struct nf_conntrack_expect *)ptr;
1174 struct sk_buff *skb;
1175 unsigned int type;
1176 unsigned char *b;
1177 int flags = 0;
1178
1179 if (events & IPEXP_NEW) {
1180 type = IPCTNL_MSG_EXP_NEW;
1181 flags = NLM_F_CREATE|NLM_F_EXCL;
1182 } else
1183 return NOTIFY_DONE;
1184
b3a27bfb
PNA		 1185 if (!nfnetlink_has_listeners(NFNLGRP_CONNTRACK_EXP_NEW))
1186 return NOTIFY_DONE;
1187
c1d10adb
PNA		 1188 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1189 if (!skb)
1190 return NOTIFY_DONE;
1191
1192 b = skb->tail;
1193
b633ad5f 1194 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
c1d10adb
PNA		 1195 nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
1196 nfmsg = NLMSG_DATA(nlh);
1197
1198 nlh->nlmsg_flags = flags;
1199 nfmsg->nfgen_family = exp->tuple.src.l3num;
1200 nfmsg->version = NFNETLINK_V0;
1201 nfmsg->res_id = 0;
1202
1203 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1204 goto nfattr_failure;
1205
1206 nlh->nlmsg_len = skb->tail - b;
1207 nfnetlink_send(skb, 0, NFNLGRP_CONNTRACK_EXP_NEW, 0);
1208 return NOTIFY_DONE;
1209
1210nlmsg_failure:
1211nfattr_failure:
1212 kfree_skb(skb);
1213 return NOTIFY_DONE;
1214}
1215#endif
1216
1217static int
1218ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1219{
1220 struct nf_conntrack_expect *exp = NULL;
1221 struct list_head *i;
1222 u_int32_t *id = (u_int32_t *) &cb->args[0];
87711cb8
PNA		 1223 struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
1224 u_int8_t l3proto = nfmsg->nfgen_family;
c1d10adb 1225
c1d10adb
PNA		 1226 read_lock_bh(&nf_conntrack_lock);
1227 list_for_each_prev(i, &nf_conntrack_expect_list) {
1228 exp = (struct nf_conntrack_expect *) i;
87711cb8
PNA		 1229 if (l3proto && exp->tuple.src.l3num != l3proto)
1230 continue;
c1d10adb
PNA		 1231 if (exp->id <= *id)
1232 continue;
1233 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).pid,
1234 cb->nlh->nlmsg_seq,
1235 IPCTNL_MSG_EXP_NEW,
1236 1, exp) < 0)
1237 goto out;
1238 *id = exp->id;
1239 }
1240out:
1241 read_unlock_bh(&nf_conntrack_lock);
1242
c1d10adb
PNA		 1243 return skb->len;
1244}
1245
1246static const size_t cta_min_exp[CTA_EXPECT_MAX] = {
1247 [CTA_EXPECT_TIMEOUT-1] = sizeof(u_int32_t),
1248 [CTA_EXPECT_ID-1] = sizeof(u_int32_t)
1249};
1250
1251static int
1252ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1253 struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
1254{
1255 struct nf_conntrack_tuple tuple;
1256 struct nf_conntrack_expect *exp;
1257 struct sk_buff *skb2;
1258 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1259 u_int8_t u3 = nfmsg->nfgen_family;
1260 int err = 0;
1261
c1d10adb
PNA		 1262 if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp))
1263 return -EINVAL;
1264
1265 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1266 u32 rlen;
1267
c1d10adb
PNA		 1268 if ((*errp = netlink_dump_start(ctnl, skb, nlh,
1269 ctnetlink_exp_dump_table,
1270 ctnetlink_done)) != 0)
1271 return -EINVAL;
1272 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
1273 if (rlen > skb->len)
1274 rlen = skb->len;
1275 skb_pull(skb, rlen);
1276 return 0;
1277 }
1278
1279 if (cda[CTA_EXPECT_MASTER-1])
1280 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1281 else
1282 return -EINVAL;
1283
1284 if (err < 0)
1285 return err;
1286
1287 exp = nf_conntrack_expect_find(&tuple);
1288 if (!exp)
1289 return -ENOENT;
1290
1291 if (cda[CTA_EXPECT_ID-1]) {
1292 u_int32_t id = *(u_int32_t *)NFA_DATA(cda[CTA_EXPECT_ID-1]);
1293 if (exp->id != ntohl(id)) {
1294 nf_conntrack_expect_put(exp);
1295 return -ENOENT;
1296 }
1297 }
1298
1299 err = -ENOMEM;
1300 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1301 if (!skb2)
1302 goto out;
4e9b8269 1303
c1d10adb
PNA		 1304 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1305 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
1306 1, exp);
1307 if (err <= 0)
1308 goto free;
1309
1310 nf_conntrack_expect_put(exp);
1311
1312 return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1313
1314free:
1315 kfree_skb(skb2);
1316out:
1317 nf_conntrack_expect_put(exp);
1318 return err;
1319}
1320
1321static int
1322ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1323 struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
1324{
1325 struct nf_conntrack_expect *exp, *tmp;
1326 struct nf_conntrack_tuple tuple;
1327 struct nf_conntrack_helper *h;
1328 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1329 u_int8_t u3 = nfmsg->nfgen_family;
1330 int err;
1331
1332 if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp))
1333 return -EINVAL;
1334
1335 if (cda[CTA_EXPECT_TUPLE-1]) {
1336 /* delete a single expect by tuple */
1337 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1338 if (err < 0)
1339 return err;
1340
1341 /* bump usage count to 2 */
1342 exp = nf_conntrack_expect_find(&tuple);
1343 if (!exp)
1344 return -ENOENT;
1345
1346 if (cda[CTA_EXPECT_ID-1]) {
1347 u_int32_t id =
1348 *(u_int32_t *)NFA_DATA(cda[CTA_EXPECT_ID-1]);
1349 if (exp->id != ntohl(id)) {
1350 nf_conntrack_expect_put(exp);
1351 return -ENOENT;
1352 }
1353 }
1354
1355 /* after list removal, usage count == 1 */
1356 nf_conntrack_unexpect_related(exp);
1357 /* have to put what we 'get' above.
1358 * after this line usage count == 0 */
1359 nf_conntrack_expect_put(exp);
1360 } else if (cda[CTA_EXPECT_HELP_NAME-1]) {
1361 char *name = NFA_DATA(cda[CTA_EXPECT_HELP_NAME-1]);
1362
1363 /* delete all expectations for this helper */
1364 write_lock_bh(&nf_conntrack_lock);
1365 h = __nf_conntrack_helper_find_byname(name);
1366 if (!h) {
1367 write_unlock_bh(&nf_conntrack_lock);
1368 return -EINVAL;
1369 }
1370 list_for_each_entry_safe(exp, tmp, &nf_conntrack_expect_list,
1371 list) {
dc808fe2
HW		 1372 struct nf_conn_help *m_help = nfct_help(exp->master);
1373 if (m_help->helper == h
c1d10adb
PNA		 1374 && del_timer(&exp->timeout)) {
1375 nf_ct_unlink_expect(exp);
1376 nf_conntrack_expect_put(exp);
1377 }
1378 }
1379 write_unlock_bh(&nf_conntrack_lock);
1380 } else {
1381 /* This basically means we have to flush everything*/
1382 write_lock_bh(&nf_conntrack_lock);
1383 list_for_each_entry_safe(exp, tmp, &nf_conntrack_expect_list,
1384 list) {
1385 if (del_timer(&exp->timeout)) {
1386 nf_ct_unlink_expect(exp);
1387 nf_conntrack_expect_put(exp);
1388 }
1389 }
1390 write_unlock_bh(&nf_conntrack_lock);
1391 }
1392
1393 return 0;
1394}
1395static int
1396ctnetlink_change_expect(struct nf_conntrack_expect *x, struct nfattr *cda[])
1397{
1398 return -EOPNOTSUPP;
1399}
1400
1401static int
1402ctnetlink_create_expect(struct nfattr *cda[], u_int8_t u3)
1403{
1404 struct nf_conntrack_tuple tuple, mask, master_tuple;
1405 struct nf_conntrack_tuple_hash *h = NULL;
1406 struct nf_conntrack_expect *exp;
1407 struct nf_conn *ct;
dc808fe2 1408 struct nf_conn_help *help;
c1d10adb
PNA		 1409 int err = 0;
1410
c1d10adb
PNA		 1411 /* caller guarantees that those three CTA_EXPECT_* exist */
1412 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1413 if (err < 0)
1414 return err;
1415 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1416 if (err < 0)
1417 return err;
1418 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1419 if (err < 0)
1420 return err;
1421
1422 /* Look for master conntrack of this expectation */
1423 h = nf_conntrack_find_get(&master_tuple, NULL);
1424 if (!h)
1425 return -ENOENT;
1426 ct = nf_ct_tuplehash_to_ctrack(h);
dc808fe2 1427 help = nfct_help(ct);
c1d10adb 1428
dc808fe2 1429 if (!help || !help->helper) {
c1d10adb
PNA		 1430 /* such conntrack hasn't got any helper, abort */
1431 err = -EINVAL;
1432 goto out;
1433 }
1434
1435 exp = nf_conntrack_expect_alloc(ct);
1436 if (!exp) {
1437 err = -ENOMEM;
1438 goto out;
1439 }
1440
1441 exp->expectfn = NULL;
1442 exp->flags = 0;
1443 exp->master = ct;
1444 memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
1445 memcpy(&exp->mask, &mask, sizeof(struct nf_conntrack_tuple));
1446
1447 err = nf_conntrack_expect_related(exp);
1448 nf_conntrack_expect_put(exp);
1449
1450out:
1451 nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
1452 return err;
1453}
1454
1455static int
1456ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1457 struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
1458{
1459 struct nf_conntrack_tuple tuple;
1460 struct nf_conntrack_expect *exp;
1461 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1462 u_int8_t u3 = nfmsg->nfgen_family;
1463 int err = 0;
1464
c1d10adb
PNA		 1465 if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp))
1466 return -EINVAL;
1467
1468 if (!cda[CTA_EXPECT_TUPLE-1]
1469 || !cda[CTA_EXPECT_MASK-1]
1470 || !cda[CTA_EXPECT_MASTER-1])
1471 return -EINVAL;
1472
1473 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1474 if (err < 0)
1475 return err;
1476
1477 write_lock_bh(&nf_conntrack_lock);
1478 exp = __nf_conntrack_expect_find(&tuple);
1479
1480 if (!exp) {
1481 write_unlock_bh(&nf_conntrack_lock);
1482 err = -ENOENT;
1483 if (nlh->nlmsg_flags & NLM_F_CREATE)
1484 err = ctnetlink_create_expect(cda, u3);
1485 return err;
1486 }
1487
1488 err = -EEXIST;
1489 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1490 err = ctnetlink_change_expect(exp, cda);
1491 write_unlock_bh(&nf_conntrack_lock);
1492
c1d10adb
PNA		 1493 return err;
1494}
1495
1496#ifdef CONFIG_NF_CONNTRACK_EVENTS
1497static struct notifier_block ctnl_notifier = {
1498 .notifier_call = ctnetlink_conntrack_event,
1499};
1500
1501static struct notifier_block ctnl_notifier_exp = {
1502 .notifier_call = ctnetlink_expect_event,
1503};
1504#endif
1505
1506static struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
1507 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
1508 .attr_count = CTA_MAX, },
1509 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
1510 .attr_count = CTA_MAX, },
1511 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
1512 .attr_count = CTA_MAX, },
1513 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
1514 .attr_count = CTA_MAX, },
1515};
1516
1517static struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
1518 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
1519 .attr_count = CTA_EXPECT_MAX, },
1520 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
1521 .attr_count = CTA_EXPECT_MAX, },
1522 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
1523 .attr_count = CTA_EXPECT_MAX, },
1524};
1525
1526static struct nfnetlink_subsystem ctnl_subsys = {
1527 .name = "conntrack",
1528 .subsys_id = NFNL_SUBSYS_CTNETLINK,
1529 .cb_count = IPCTNL_MSG_MAX,
1530 .cb = ctnl_cb,
1531};
1532
1533static struct nfnetlink_subsystem ctnl_exp_subsys = {
1534 .name = "conntrack_expect",
1535 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
1536 .cb_count = IPCTNL_MSG_EXP_MAX,
1537 .cb = ctnl_exp_cb,
1538};
1539
1540MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
34f9a2e4 1541MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
c1d10adb
PNA		 1542
1543static int __init ctnetlink_init(void)
1544{
1545 int ret;
1546
1547 printk("ctnetlink v%s: registering with nfnetlink.\n", version);
1548 ret = nfnetlink_subsys_register(&ctnl_subsys);
1549 if (ret < 0) {
1550 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1551 goto err_out;
1552 }
1553
1554 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
1555 if (ret < 0) {
1556 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1557 goto err_unreg_subsys;
1558 }
1559
1560#ifdef CONFIG_NF_CONNTRACK_EVENTS
1561 ret = nf_conntrack_register_notifier(&ctnl_notifier);
1562 if (ret < 0) {
1563 printk("ctnetlink_init: cannot register notifier.\n");
1564 goto err_unreg_exp_subsys;
1565 }
1566
1567 ret = nf_conntrack_expect_register_notifier(&ctnl_notifier_exp);
1568 if (ret < 0) {
1569 printk("ctnetlink_init: cannot expect register notifier.\n");
1570 goto err_unreg_notifier;
1571 }
1572#endif
1573
1574 return 0;
1575
1576#ifdef CONFIG_NF_CONNTRACK_EVENTS
1577err_unreg_notifier:
1578 nf_conntrack_unregister_notifier(&ctnl_notifier);
1579err_unreg_exp_subsys:
1580 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1581#endif
1582err_unreg_subsys:
1583 nfnetlink_subsys_unregister(&ctnl_subsys);
1584err_out:
1585 return ret;
1586}
1587
1588static void __exit ctnetlink_exit(void)
1589{
1590 printk("ctnetlink: unregistering from nfnetlink.\n");
1591
1592#ifdef CONFIG_NF_CONNTRACK_EVENTS
e64a70be 1593 nf_conntrack_expect_unregister_notifier(&ctnl_notifier_exp);
c1d10adb
PNA		 1594 nf_conntrack_unregister_notifier(&ctnl_notifier);
1595#endif
1596
1597 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1598 nfnetlink_subsys_unregister(&ctnl_subsys);
1599 return;
1600}
1601
1602module_init(ctnetlink_init);
1603module_exit(ctnetlink_exit);
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